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PDF RT7233 Data sheet ( Hoja de datos )
| Número de pieza | RT7233 | |
| Descripción | (RT7231 - RT7234) Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT7233 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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®
RT7231/32/33/34
4A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
General Description
The RT7231/32/33/34 is a synchronous step-down DC/
DC converter with Advanced Constant On-Time (ACOTTM)
mode control. It achieves high power density to deliver up
to 4A output current from a 4.5V to 18V input supply. The
proprietary ACOTTM mode offers an optimal transient
response over a wide range of loads and all kinds of ceramic
capacitors, which allows the device to adopt very low ESR
output capacitor for ensuring performance stabilization. In
addition, RT7231/32/33/34 keeps an excellent constant
switching frequency under line and load variation and the
integrated synchronous power switches with the ACOTTM
mode operation provides high efficiency in whole output
current load range. Cycle-by-cycle current limit provides
an accurate protection by a valley detection of low side
MOSFET and external soft-start setting eliminates input
current surge during startup. Protection functions include
thermal shutdown for RT7231/32/33/34, output Under
Voltage Protection (UVP) / Over Voltage Protection (OVP)
for RT7231/32. When the UVP/OVP is triggered, the device
will enter latch mode for TSSOP-14 (Exposed Pad), and
hiccup mode for WDFN-10L 3x3.
The RT7231/32 are available in TSSOP-14 (Exposed Pad)
and WDFN-10L 3x3 packages, and the RT7231 is operated
in forced continuous conduction mode.
The RT7233/34 are available in the SOP-8 (Exposed Pad)
package, and the RT7233 is operated in forced continuous
conduction mode.
Features
z ACOTTM Mode Enables Fast Transient Response
z 4.5V to 18V Input Voltage Range
z 4A Output Current
z 50mΩ Internal Low Site N-MOSFET
z Advanced Constant On-Time Control
z Support All Ceramic Capacitors
z Up to 95% Efficiency
z 650kHz Switching Frequency at all Load Current
(RT7231, RT7233)
z Discontinuous Operating Mode at Light Load
(RT7232, RT7234)
z Adjustable Output Voltage from 0.765V to 8V
z Adjustable Soft-Start
z Cycle-by-Cycle Current Limit
z Input Under Voltage Lockout
z Thermal Shutdown
z RoHS Compliant and Halogen Free
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
Simplified Application Circuit
VIN
Enable
Power GOOD
RT7231/32/33/34
VIN SW
VCC*
EN
PGOOD*
BOOT
FB
PGND
VOUT
* : VCC pin for TSSOP-14 (Exposed Pad) only.
VS pin for TSSOP-14 (Exposed Pad) only.
VREG5
SS GND*
GND pin for TSSOP-14 (Exposed Pad) only.
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
VS*
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7231/32/33/34-00 March 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
RT7231/32/33/34
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VIN, VCC --------------------------------------------------------------------------------------- −0.3V to 20V
z Switch Voltage, SW ----------------------------------------------------------------------------------------------- −0.3V to (VIN + 0.3V)
< 10ns ---------------------------------------------------------------------------------------------------------------- −5V to 25V
z BOOT to SW -------------------------------------------------------------------------------------------------------- −0.3V to 6V
z EN ---------------------------------------------------------------------------------------------------------------------- −0.3V to 20V
z Other Pins ------------------------------------------------------------------------------------------------------------ −0.3V to 6V
z Power Dissipation, PD @ TA = 25°C
TSSOP-14 (Exposed Pad) --------------------------------------------------------------------------------------- 2.50W
WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------ 1.67W
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------------- 2.041W
z Package Thermal Resistance (Note 2)
TSSOP-14 (Exposed Pad), θJA --------------------------------------------------------------------------------- 40°C/W
WDFN-10L 3x3, θJA ------------------------------------------------------------------------------------------------ 60°C/W
WDFN-10L 3x3, θJC ------------------------------------------------------------------------------------------------ 7.5°C/W
SOP-8 (Exposed Pad), θJA --------------------------------------------------------------------------------------- 49°C/W
SOP-8 (Exposed Pad), θJC -------------------------------------------------------------------------------------- 15°C/W
z Junction Temperature Range ------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------ 260°C
z Storage Temperature Range ------------------------------------------------------------------------------------- −65°C to 150°C
Recommended Operating Conditions (Note 3)
z Supply Voltage, VIN ----------------------------------------------------------------------------------------------- 4.5V to 18V
z Junction Temperature Range ------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range ------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Supply Current
Shutdown Current
ISHDN
VEN = 0V
Quiescent Current
IQ VEN = 5V, VFB = 0.8V
Logic Threshold
Logic-High
EN Input Voltage
Logic-Low
VFB Voltage and Discharge Resistance
Feedback Threshold Voltage VFB
TA = 25°C
TA = −40°C to 85°C
Feedback Input Current
IFB
VFB = 0.8V
VOUT Discharge Resistance RDIS
VEN = 0V, VS = 0.5V
VREG5 Output
VREG5 Output Voltage
VREG5
6V ≤ VIN ≤ 18V, 0 < IVREG5 < 5mA
Min Typ Max Unit
-- 1 10 μA
-- 1 1.3 mA
2 -- 18
V
-- -- 0.4
0.757 0.765 0.773
0.755 -- 0.775
-- 0.01 0.1
-- 50 100
V
μA
Ω
4.8 5.1 5.4 V
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7231/32/33/34-00 March 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
RT7231/32/33/34
EN Threshold Voltage vs. Temperature
1.5
1.4
1.3
1.2 Rising
1.1
1.0 Falling
0.9
0.8
0.7
-50
-25
VIN = 12V, VOUT = 1.05V
0 25 50 75
Temperature (°C)
100 125
Power Good from EN Turn On
RT7231/32
VEN
(5V/Div)
VPGOOD
(5V/Div)
VOUT
(1V/Div)
IOUT
(5A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (250μs/Div)
UVLO Voltage vs. Temperature
4.0
3.9
3.8 Rising
3.7
3.6
Falling
3.5
3.4
-50
-25
0 25 50 75
Temperature (°C)
100 125
Power Good from EN Turn Off
RT7231/32
VEN
(5V/Div)
VPGOOD
(5V/Div)
VOUT
(1V/Div)
IOUT
(5A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (2.5ms/Div)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7231/32/33/34-00 March 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RT7233.PDF ] | |
Hoja de datos destacado
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